QKeyEvent Class Reference
The QKeyEvent class contains parameters that describe a key event.
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#include <qevent.h>
Inherits QEvent.
List of all member functions.
Public Members
QKeyEvent ( Type type, int key, int ascii, int state, const QString & text=QString::null, bool autorep=FALSE, ushort count=1 )Â
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ButtonStateÂ
state () const
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Detailed Description
The QKeyEvent class contains parameters that describe a key event.
Key events occur when a key is pressed or released when a widget has
keyboard input focus.
A key event contains a special accept flag which tells whether the
receiver wants the key. You should call QKeyEvent::ignore() if the
key press or release event is not handled by your widget.
The QWidget::setEnable() function can be used to enable or disable mouse
and keyboard events for a widget.
The event handlers QWidget::keyPressEvent() and QWidget::keyReleaseEvent()
receive key events.
See also QFocusEvent and QWidget::grabKeyboard().
Examples:
picture/picture.cpp
Member Function Documentation
QKeyEvent::QKeyEvent ( Type type, int key, int ascii, int state, const QString & text=QString::null, bool autorep=FALSE, ushort count=1 )
Constructs a key event object.
The type parameter must be QEvent::KeyPress or QEvent::KeyRelease.
If key is 0, the event is not a result of a known key (e.g. it
may be the result of a compose sequence or keyboard macro).
text will be returned by text().
If autorep is TRUE then isAutoRepeat() will be TRUE.
count is the number of single keys.
The accept flag is set to TRUE.
void QKeyEvent::accept ()
Sets the accept flag of the key event object.
Setting the accept parameter indicates that the receiver of the event wants
the key event. Unwanted key events are sent to the parent widget.
The accept flag is set by default.
See also ignore().
int QKeyEvent::ascii () const
Returns the ASCII code of the key that was pressed or released.
We recommend using text() instead.
See also text().
Examples:
picture/picture.cpp
int QKeyEvent::count () const
Returns the number of single keys for this event. If text() is not
empty, this is simply the length of the string.
However, Qt also compresses invisible keycodes, such as BackSpace.
For those, count() returns the number of key presses/repeats this
event represents.
See also QWidget::setKeyCompression().
void QKeyEvent::ignore ()
Clears the accept flag parameter of the key event object.
Clearing the accept parameter indicates that the event receiver does
not want the key event. Unwanted key events are sent to the parent
widget.
The accept flag is set by default.
See also accept().
bool QKeyEvent::isAccepted () const
Returns TRUE if the receiver of the event wants to keep the key.
bool QKeyEvent::isAutoRepeat () const
Returns TRUE if this event comes from an auto-repeating key and
FALSE if it comes from an initial press.
Note that if the event is a multiple-key compressed event which
partly is due to autorepeat, this function returns an indeterminate
value.
int QKeyEvent::key () const
Returns the code of the key that was pressed or released.
The header file qnamespace.h lists the possible keyboard codes. These codes
are independent of the underlying window system.
Key code 0 means that the event is not a result of a known key (e.g. it
may be the result of a compose sequence or keyboard macro).
ButtonState QKeyEvent::state () const
Returns the keyboard modifier flags that existed immediately before
the event occurred.
The returned value is ShiftButton, ControlButton and AltButton
OR'ed together.
See also stateAfter().
ButtonState QKeyEvent::stateAfter () const
Returns the keyboard modifier flags that existed immediately after
the event occurred.
Warning: This function cannot be trusted.
See also state().
QString QKeyEvent::text () const
Returns the Unicode text which this key generated.
See also QWidget::setKeyCompression().
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